SAPS II Calculator

Use the worst value for each physiological variable within the past 24 hours.

Age

years

Vitals

Heart rate

bpm

Systolic BP

mmHg

Temp

C or F

Glasgow coma score

Oxygenation

Mechanical ventilation or CPAP

YesNo

PaO2

FiO2

%

Renal

Urine output

mL

BUN

Chemistry

Sodium

mEq/L

Potassium

mEq/L

Bicarbonate

mEq/L

Bilirubin

Other

WBC

x 109/L

Chronic diseases

Metastatic cancerHematologic malignancyAIDS

Type of admission

US units

RESULTS

Total score:

70 pts

Estimated mortality:

83.8%

Variable

Points

% Points

1. Age 70-74 yrs

15

21.4%

2. Urine output < 500 mL/day

11

15.7%

3. P:F ratio 100-199

9

12.9%

4. Medical admission

6

8.6%

5. Bicarbonate < 15 mEq/L

6

8.6%

6. BUN 28-83 mg/dL

6

8.6%

7. Glasgow coma score 11-13

5

7.1%

8. Systolic BP 70-99 mmHg

5

7.1%

9. HR 120-159 bpm

4

5.7%

10. Temp ≥ 39°C

3

4.3%

11. No chronic diseases

0

0%

12. WBC 1.0-19.9 (103/cu mm)

0

0%

13. Potassium 3.0-4.9 mEq/dL

0

0%

14. Sodium 125-144 mEq/L

0

0%

15. Bilirubin < 4 mg/dL

0

0%

Total

70

100%

About This Calculator

The Simplified Acute Physiology Score (SAPS II) is a severity score and mortality estimation tool developed from a large sample of medical and surgical patients in North America and Europe.1

Sample Inclusion and Exclusion

The study analyzed a total of 12,997 patients from 137 medical, surgical, or mixed intensive care units in 12 countries from 9/30/1991 to 12/27/1991. Patients with burn injuries, coronary care unit patients, and cardiac surgery patients were excluded from analysis.

Study Variables

The SAPS II score is made of 12 physiological variables and 3 disease-related variables. The worst physiological variables were collected within the first 24 hours of ICU admission. The "worst" measurement was defined as the measure that correlated to the highest number of points. The study did not continually calculate SAPS II scores beyond the first 24 hours of ICU admission. The SAPS II score ranges from 0 to 163 points.

Correlation of Total Score and Hospital Mortality

Ability to Predict Hospital Mortality

The study used a pre-defined 65% of the patient population to define the SAPS II criteria, and the remaining 35% for validation purposes. The area under the ROC curve in the validation group was 0.86 (95% CI: 0.84 to 0.88). This AUC was considered superior to the previous SAPS score, which demonstrated an AUC ROC of 0.80.

Note that there is a sigmoidal relationship between mortality and the total SAPS II score, as demonstrated by the graph below: